Question

his hands trembled and there was an insistent throbbing at his temples as he began to follow out the scientist’s directions. source: the gray phantom in the sentence above, insistent has the same or almost the same meaning as: universal repetitive temporary periodical

Explanation:

"Insistent" implies a continuous and persistent quality. "Repetitive" also suggests something that occurs again and again in a persistent way. "Universal" means widespread or relating to all, "temporary" means lasting for a short time, and "periodical" refers to something that occurs at regular intervals. Repetitive is the closest in meaning to insistent in this context.

Answer:

B. repetitive